Thrombocytosis is a condition in which the body produces excess number of platelets. The complications of thrombocytosis may include strokes, heart attacks , bleeding or blood clots. Thrombocytosis is classified into:
(1) Primary thrombocytosis also called essential thrombocythemia, is a single disease entity, which is not caused by other health problems.

(2) Secondary thrombocytosis can be caused by other health problems, such as: chronic inflammation, severe bleeding, iron deficiency, stress, surgery, medication, osteoporosis, splenectomy, anemia, polycythemia vera (splenomegalic polycythemia, Vaquez-Osler syndrome, erythremia), and cancer.

Prognosis
Some patients may die as a result of blood clots or uncontrolled bleeding but many patients with thrombocytosis remain symptom free for long periods of time.

Chinese Herb Therapy 
Formula 1
Name of formula: shui zhi tang
Usage: high pressure of the portal vein; increase of platelet counts after splenectomy.

Prescription﹕
Hirudo (Shuizhi) 18 g (smashed), meng chong  9 g, Opsithoplatia orientalis (Dibiechong) 9 g, Semen Persicae (Taoren) 9 g, Cortex Radicis (Mudanpi) 9 g, Radix Paeoniae Rubra (Chishaoyao) 15 g, Radix Rehmanniae (Shengdihuang) 15 g, Pollen Typhae (Puhuang)">Pollen Typhae (Puhuang) 15 g (wrapped), Ganoderma lucidum (Lingzhi) 15 g.
Boil with water. Use as tea.

Effectiveness:
Among eighteen patients,  ten of them  showed that the platelet count started to go down after 2 dosages, and three of them showed that the platelet count started to go down after 3 dosages.